Leviticus 5:5-7

New Revised Standard Version Catholic Edition

⁵ When you realize your guilt in any of these, you shall confess the sin that you have committed. ⁶ And you shall bring to the Lord, as your penalty for the sin that you have committed, a female from the flock, a sheep or a goat, as a sin offering; and the priest shall make atonement on your behalf for your sin.

⁷ But if you cannot afford a sheep, you shall bring to the Lord, as your penalty for the sin that you have committed, two turtledoves or two pigeons, one for a sin offering and the other for a burnt offering.